JPS6435616A - Constant-current circuit - Google Patents

Constant-current circuit

Info

Publication number
JPS6435616A
JPS6435616A JP19008987A JP19008987A JPS6435616A JP S6435616 A JPS6435616 A JP S6435616A JP 19008987 A JP19008987 A JP 19008987A JP 19008987 A JP19008987 A JP 19008987A JP S6435616 A JPS6435616 A JP S6435616A
Authority
JP
Japan
Prior art keywords
current
constant
error
widler
variation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP19008987A
Other languages
Japanese (ja)
Other versions
JP2663449B2 (en
Inventor
Yoichiro Minami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP19008987A priority Critical patent/JP2663449B2/en
Publication of JPS6435616A publication Critical patent/JPS6435616A/en
Application granted granted Critical
Publication of JP2663449B2 publication Critical patent/JP2663449B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To decrease a variation of an output current at the time of variation of a current amplification factor, by converting an error current generated in a Widler constant-current circuit, to an error voltage, and applying a negative feedback to the Widler constant-current circuit through a transconductance amplifier. CONSTITUTION:By a drop of a current amplification factor of PNP transistors Tr Q11, Q12 for constituting a Widler constant-current circuit, a current error of each collector current I1, I2 generates the same currents I1', I2' as the currents I1, I2 by Trs Q15, Q16 and a resistance R12. Subsequently, it is converted to a voltage error DELTAVd by resistances R13, R14. Next, this error DELTAVd is converted to a current IF by a transconductance amplifier TCA and applied to a collector connecting point of the Trs Q11, Q13 of the Widler constant-current circuit, by which a negative feedback loop is constituted. That is, a loop of (current IB large) current difference I-I2 large) (current difference I1'-I2' large) (IF large) (current difference I1-I2 small) is constituted. In such a way, a variation of an output current at the time of a variation of a current amplification factor can be suppressed small.
JP19008987A 1987-07-31 1987-07-31 Constant current circuit Expired - Lifetime JP2663449B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19008987A JP2663449B2 (en) 1987-07-31 1987-07-31 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19008987A JP2663449B2 (en) 1987-07-31 1987-07-31 Constant current circuit

Publications (2)

Publication Number Publication Date
JPS6435616A true JPS6435616A (en) 1989-02-06
JP2663449B2 JP2663449B2 (en) 1997-10-15

Family

ID=16252181

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19008987A Expired - Lifetime JP2663449B2 (en) 1987-07-31 1987-07-31 Constant current circuit

Country Status (1)

Country Link
JP (1) JP2663449B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08314561A (en) * 1995-05-19 1996-11-29 Nec Corp Starting circuit
US6031414A (en) * 1997-06-30 2000-02-29 Nec Corporation Constant current circuit with small output current fluctuation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08314561A (en) * 1995-05-19 1996-11-29 Nec Corp Starting circuit
US6031414A (en) * 1997-06-30 2000-02-29 Nec Corporation Constant current circuit with small output current fluctuation

Also Published As

Publication number Publication date
JP2663449B2 (en) 1997-10-15

Similar Documents

Publication Publication Date Title
US4097767A (en) Operational rectifier
JPS6435616A (en) Constant-current circuit
JPS57204611A (en) Voltage follower circuit
JPS5590110A (en) Amplifier
JPS6450604A (en) High gain amplifier using two current mirrors
JPS5643808A (en) Signal converting circuit
JPS56144610A (en) Converting circuit
US3005956A (en) Current amplifier for low impedance outputs
JPS6451813A (en) Output voltage limit circuit
JPS5728407A (en) Amplifying circuit
JPS56132006A (en) Differential amplifier
JPS5739424A (en) Reference voltage source
JPS56153812A (en) Amplifier
JPS575406A (en) Current limiting circuit
JPS5698914A (en) Amplifier of low distortion factor
JPS5750114A (en) Phase switching amplifying circuit
JPS56136006A (en) Inverting amplifier
JPS6449308A (en) Peak clipping circuit
JPS5783912A (en) Current amplifying circuit
JPS6416006A (en) Dc amplifier circuit
JPS5789318A (en) Variable gain amplifier
JPS5778163A (en) Base diffused restistor
FR2295643A1 (en) Control circuit for semiconductor switching device - makes use of two opposed current generators and includes two differential amplifiers
JPS6441512A (en) Clip circuit
JPS56117412A (en) Ic circuit